Alloy



Patented Dec. 29, 1942 ALLOY Samuel Turkus, East Orange, N. J., assignor to American smelting and Refining. Company, New York,-N. Y., a corporation of New Jersey No Drawing. Application June 6, 1942; 'Serial No. 446,111

1 Claim. This invention relates to lead alloys'and more particularly .to lead-tin-bismuth-silver alloys..

the salient physical characteristics of the alloys of my invention which have been determined.

. Bond strength Composition approx. per cent muid Tensile Elqngw lap joint psi Spregd us no strength (anon) psi 11.

Pb s11 Ag Bi Sb Copper Steel Percent The allws of the present invention are especially useful as solders but they'may be utilized for other purposes where it is desired to employ an alloy having the physical characteristics of the metals hereinafter described. The present applicationis a continuation in part of my prior application Se- 20 of these elements, alloys are-formed which are 30 particularly valuable as solders; I have also found that the tin content of my new alloy can be considerably decreasedas compared with conventional solder composition without adversely af- I iecting the requisite soldering properties.

My invention, broadly speaking, consists in the provision of quaternary alloys of lead, tin, bismuth and silver and similar compositions comprising this quaternary base alloy with the addition of small amounts of other constituents which impart further desired'properties thereto or enhance the beneficial characteristics possessed by said base alloy.

One of the principal objects of the present invention is to provide a lead alloy solder which is comparable in working and physical properties with the conventional lead-tin'solders but contains decidedly less percentage amounts of tin.

Other objects and advantages of-this invention 50 become apparent as the description proceeds.

As shown in the table, the quaternary alloys of lead-tin-bismuth and silver contain small perranges of melting points and other properties can be obtained.

The amount of tin maybe reduced below 10% but the melting'point range is increased and the melted solder is slightly less fluid. While the preferred alloy compositions are stated in the table, I have found that percentage amount; of

the ingredients may be varied within a fairly broad range. For example, the alloy composi-" tion may comprise from 5% to tin, 0.3 to 5% bismuth, 0.5% to 5.0% silver, and from 0.25% to 3% antimony with the balance of the composition being substantially all lead.

From the data given, it will bereadily apparent that the alloys of this invention possess and exhibit properties which make them suitable for "various uses other than solders, andsuch other uses are contemplated within the scope of this }.ing from 5% to 40% tin, 0.3% to 5% bismuth, 0.5% to 5.0% silver, 0.25% to 3% antimony, with the following table there is listed some of I the balance of the alloycomposition being made up substantially all of lead. V

I TURKUS. 

